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Oxygen Sensors

Measuring Oxygen (Deficiency and Enrichment)

Fuel Cell Oxygen Sensors

Sensor generates electrical current proportional to the O2 concentration

Sensor used up over time (usually last one to three years)

Oxygen reduced to hydroxyl ions at cathode:

O2 + 2H2O + 4e- 4OH-

Hydroxyl ions oxidize lead (anode):

2Pb + 4OH- 2PbO + 2H2O + 4e-

Overall cell reaction:

2Pb + O2 2PbO

Oxygen Sensor (Simplified)

Oxygen Sensor (Simplified)

Major Components of an Oxygen Sensor

Major Components of an Oxygen Sensor

Capillary Pore Benefits

  • True percent by volume sensor
  • Not influenced by changes in pressure due to:
    • Barometric pressure
    • Pressurized buildings
    • Altitude
Capillary Pore Benefits
Capillary Pore Benefits

Capillary pore (located under external moisture barrier filter)

O2 sensor output as function of concentration

O2 sensor output as function of concentration

O2 sensor output as function of the ambient temperature

O2 sensor output as function of concentration

Actual readings of G450 cycled from +20